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Peroxydisulfate Activation for Efficient Degradation of Tetracycline by N-rGO/Fe3O4: Synthesis, Property, and Mechanism

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Abstract

In response to the high cost of activated persulfate technology, we have successfully prepared a composite catalyst N-rGO/Fe3O4 for reuse through magnetic separation. The degradation efficiency of 60 mg/L tetracycline (TC) reached 100% within 120 min under optimal conditions (c[peroxysulfate, PDS] = 2 mM; m(PDS):m(N-rGO/Fe3O4) = 1:6; pH = 3.0), while N-rGO/Fe3O4 maintained a high stability and reusability value in the cycling experiment. We found that in the N-rGO/Fe3O4 + PDS system, SO4· and ·OH radicals were the most dominant reactants for TC decomposition, with non-radical reactions also contributing to TC degradation. Furthermore, we inferred four possible decomposition pathways of TC from the analysis of intermediates: (1) dehydration, (2) demethylation, (3) hydroxylation, and (4) deamidation. This study provides a new strategy for the effective treatment of antibiotic wastewater and hopes to be applied to the treatment of actual antibiotic wastewater in the future.

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Funding

The authors acknowledge Science and Technology Project of Henan Province (Grant No. 232102320132), Key projects of Education Department of Henan Province (Grant No. 21B610002), supported by Natural Science Foundation of Henan (No. 222300420106).

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Correspondence to Junfeng Wu or Xiangling Zhang.

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Bai, J., Wang, L., Wu, J. et al. Peroxydisulfate Activation for Efficient Degradation of Tetracycline by N-rGO/Fe3O4: Synthesis, Property, and Mechanism. Water Air Soil Pollut 234, 399 (2023). https://doi.org/10.1007/s11270-023-06376-8

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  • DOI: https://doi.org/10.1007/s11270-023-06376-8

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